| 40Ar/39Ar Thermochronological Constraints on the Timing of Collisional Orogeny in the Mian-Lüe Collision Belt,Southern Qinling Mountains |
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| 作者姓名： | LI Jinyi WANG Zongqi ZHAO Min |
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| 作者单位： | Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037 |
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| 基金项目： | the former Ministry of Geology and Mineral Resources of China;8502206; |
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| 摘 要： | Silurian, Devonian and Carboniferous geological bodies in the Mianxian-Lüeyang (Mian-Lüe) collisional belt (MLB) and its neighbouring areas, southern Qinling Mountains, China, show similar characteristics of having undergone deformation of two stages. The earlier one, which is inferred to be related to collisional orogeny between the Yangtze and Sino-Korean palaeocontinents based on previous geological data, is responsible for large-scale, north-verging recumbent folds and overthrusts, and associated with low greenschist facies metamorphism. 40Ar/39Ar dating of three muscovite samples taken from different localities yields plateau ages of 226.9(0.9 and 219.5(1.4 Ma and an apparent age of 194.5(3.0 Ma. Thus, the late Triassic collision between the Yangtze and Sino-Korean palaeocontinents has been constrained.
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| 关 键 词： | Qinling Mountains Mian-Lue collision belt muscovite 40Ar/39Ar dating collisional orogeny |
40Ar/39Ar Thermochronological Constraints on the Timing of Collisional Orogeny in the Mian-Lüe Collision Belt,Southern Qinling Mountains |
| |
| Authors: | LI Jinyi WANG Zongqi ZHAO Min |
| |
| Abstract: | Silurian, Devonian and Carboniferous geological bodies in the
Mianxian-Lüeyang (Mian-Lüe) collisional belt (MLB) and its neighbouring areas,
southern Qinling Mountains, China, show similar characteristics of having undergone
deformation of two stages. The earlier one, which is inferred to be related to collisional
orogeny between the Yangtze and Sino-Korean palaeocontinents based on previous geological
data, is responsible for large-scale, north-verging recumbent folds and overthrusts, and
associated with low greenschist facies metamorphism. 40Ar/39Ar dating of three muscovite
samples taken from different localities yields plateau ages of 226.9(0.9 and 219.5(1.4 Ma
and an apparent age of 194.5(3.0 Ma. Thus, the late Triassic collision between the Yangtze
and Sino-Korean palaeocontinents has been constrained. |
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| Keywords: | Qinling Mountains Mian-Lue collision belt muscovite 40Ar/39Ar dating collisional orogeny |
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